C++ MOZ_LIKELY函数代码示例

nsHtml5Parser::UnblockParser()
{
  MOZ_DIAGNOSTIC_ASSERT(mBlocked > 0);
  if (MOZ_LIKELY(mBlocked > 0)) {
    mBlocked--;
  }
  if (MOZ_LIKELY(mBlocked == 0)) {
    mExecutor->ContinueInterruptedParsingAsync();
  }
}

WebGLVertexAttrib0Status
WebGLContext::WhatDoesVertexAttrib0Need()
{
    MOZ_ASSERT(mCurrentProgram);
    MOZ_ASSERT(mActiveProgramLinkInfo);

    // work around Mac OSX crash, see bug 631420
#ifdef XP_MACOSX
    if (gl->WorkAroundDriverBugs() &&
        mBoundVertexArray->IsAttribArrayEnabled(0) &&
        !mActiveProgramLinkInfo->HasActiveAttrib(0))
    {
        return WebGLVertexAttrib0Status::EmulatedUninitializedArray;
    }
#endif

    if (MOZ_LIKELY(gl->IsGLES() ||
                   mBoundVertexArray->IsAttribArrayEnabled(0)))
    {
        return WebGLVertexAttrib0Status::Default;
    }

    return mActiveProgramLinkInfo->HasActiveAttrib(0)
           ? WebGLVertexAttrib0Status::EmulatedInitializedArray
           : WebGLVertexAttrib0Status::EmulatedUninitializedArray;
}

static bool
ValidateBufferUsageEnum(WebGLContext* webgl, const char* funcName, GLenum usage)
{
    switch (usage) {
    case LOCAL_GL_STREAM_DRAW:
    case LOCAL_GL_STATIC_DRAW:
    case LOCAL_GL_DYNAMIC_DRAW:
        return true;

    case LOCAL_GL_DYNAMIC_COPY:
    case LOCAL_GL_DYNAMIC_READ:
    case LOCAL_GL_STATIC_COPY:
    case LOCAL_GL_STATIC_READ:
    case LOCAL_GL_STREAM_COPY:
    case LOCAL_GL_STREAM_READ:
        if (MOZ_LIKELY(webgl->IsWebGL2()))
            return true;
        break;

    default:
        break;
    }

    webgl->ErrorInvalidEnum("%s: Invalid `usage`: 0x%04x", funcName, usage);
    return false;
}

static bool
ValidateBufferUsageEnum(WebGLContext* webgl, GLenum usage)
{
    switch (usage) {
    case LOCAL_GL_STREAM_DRAW:
    case LOCAL_GL_STATIC_DRAW:
    case LOCAL_GL_DYNAMIC_DRAW:
        return true;

    case LOCAL_GL_DYNAMIC_COPY:
    case LOCAL_GL_DYNAMIC_READ:
    case LOCAL_GL_STATIC_COPY:
    case LOCAL_GL_STATIC_READ:
    case LOCAL_GL_STREAM_COPY:
    case LOCAL_GL_STREAM_READ:
        if (MOZ_LIKELY(webgl->IsWebGL2()))
            return true;
        break;

    default:
        break;
    }

    webgl->ErrorInvalidEnumInfo("usage", usage);
    return false;
}

void
WebGLContext::UndoFakeVertexAttrib0()
{
    WebGLVertexAttrib0Status whatDoesAttrib0Need = WhatDoesVertexAttrib0Need();

    if (MOZ_LIKELY(whatDoesAttrib0Need == WebGLVertexAttrib0Status::Default))
        return;

    if (mBoundVertexArray->HasAttrib(0) && mBoundVertexArray->mAttribs[0].buf) {
        const WebGLVertexAttribData& attrib0 = mBoundVertexArray->mAttribs[0];
        gl->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, attrib0.buf->mGLName);
        if (attrib0.integer) {
            gl->fVertexAttribIPointer(0,
                                      attrib0.size,
                                      attrib0.type,
                                      attrib0.stride,
                                      reinterpret_cast<const GLvoid*>(attrib0.byteOffset));
        } else {
            gl->fVertexAttribPointer(0,
                                     attrib0.size,
                                     attrib0.type,
                                     attrib0.normalized,
                                     attrib0.stride,
                                     reinterpret_cast<const GLvoid*>(attrib0.byteOffset));
        }
    } else {
        gl->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, 0);
    }

    gl->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, mBoundArrayBuffer ? mBoundArrayBuffer->mGLName : 0);
}

bool
WebGLContext::ValidateFramebufferTarget(GLenum target,
                                        const char* const info)
{
    bool isValid = true;
    switch (target) {
    case LOCAL_GL_FRAMEBUFFER:
        break;

    case LOCAL_GL_DRAW_FRAMEBUFFER:
    case LOCAL_GL_READ_FRAMEBUFFER:
        isValid = IsWebGL2();
        break;

    default:
        isValid = false;
        break;
    }

    if (MOZ_LIKELY(isValid)) {
        return true;
    }

    ErrorInvalidEnum("%s: Invalid target: %s (0x%04x).", info, EnumName(target),
                     target);
    return false;
}

bool
nsCounterManager::AddResetOrIncrement(nsIFrame *aFrame, int32_t aIndex,
                                      const nsStyleCounterData *aCounterData,
                                      nsCounterNode::Type aType)
{
    nsCounterChangeNode *node =
        new nsCounterChangeNode(aFrame, aType, aCounterData->mValue, aIndex);

    nsCounterList *counterList = CounterListFor(aCounterData->mCounter);
    if (!counterList) {
        NS_NOTREACHED("CounterListFor failed (should only happen on OOM)");
        return false;
    }

    counterList->Insert(node);
    if (!counterList->IsLast(node)) {
        // Tell the caller it's responsible for recalculating the entire
        // list.
        counterList->SetDirty();
        return true;
    }

    // Don't call Calc() if the list is already dirty -- it'll be recalculated
    // anyway, and trying to calculate with a dirty list doesn't work.
    if (MOZ_LIKELY(!counterList->IsDirty())) {
        node->Calc(counterList);
    }
    return false;
}

  void ComputeHintIfNeeded(nsIContent* aContent,
                           nsIFrame* aTextFrame,
                           nsStyleContext& aNewContext,
                           nsStyleChangeList& aChangeList)
  {
    MOZ_ASSERT(aTextFrame);
    MOZ_ASSERT(aNewContext.GetPseudo() == nsCSSAnonBoxes::mozText);

    if (MOZ_LIKELY(!mShouldPostHints)) {
      return;
    }

    nsStyleContext* oldContext = aTextFrame->StyleContext();
    MOZ_ASSERT(oldContext->GetPseudo() == nsCSSAnonBoxes::mozText);

    // We rely on the fact that all the text children for the same element share
    // style to avoid recomputing style differences for all of them.
    //
    // TODO(emilio): The above may not be true for ::first-{line,letter}, but
    // we'll cross that bridge when we support those in stylo.
    if (mShouldComputeHints) {
      mShouldComputeHints = false;
      uint32_t equalStructs, samePointerStructs;
      mComputedHint =
        oldContext->CalcStyleDifference(&aNewContext,
                                        &equalStructs,
                                        &samePointerStructs);
    }

    if (mComputedHint) {
      aChangeList.AppendChange(aTextFrame, aContent, mComputedHint);
    }
  }

/**
 * Scan an Ident token.  This also handles Function and URL tokens,
 * both of which begin indistinguishably from an identifier.  It can
 * produce a Symbol token when an apparent identifier actually led
 * into an invalid escape sequence.
 */
bool
nsCSSScanner::ScanIdent(nsCSSToken& aToken)
{
  if (MOZ_UNLIKELY(!GatherText(IS_IDCHAR, aToken.mIdent))) {
    MOZ_ASSERT(Peek() == '\\',
               "unexpected IsIdentStart character that did not begin an ident");
    aToken.mSymbol = Peek();
    Advance();
    return true;
  }

  if (MOZ_LIKELY(Peek() != '(')) {
    aToken.mType = eCSSToken_Ident;
    return true;
  }

  Advance();
  aToken.mType = eCSSToken_Function;
  if (aToken.mIdent.LowerCaseEqualsLiteral("url")) {
    NextURL(aToken);
  } else if (aToken.mIdent.LowerCaseEqualsLiteral("var")) {
    mSeenVariableReference = true;
  }
  return true;
}

void
DOMStorageDBThread::ThreadFunc()
{
  nsresult rv = InitDatabase();

  MonitorAutoLock lockMonitor(mMonitor);

  if (NS_FAILED(rv)) {
    mStatus = rv;
    mStopIOThread = true;
    return;
  }

  while (MOZ_LIKELY(!mStopIOThread || mPreloads.Length() || mPendingTasks.HasTasks())) {
    if (MOZ_UNLIKELY(TimeUntilFlush() == 0)) {
      // Flush time is up or flush has been forced, do it now.
      UnscheduleFlush();
      if (mPendingTasks.Prepare()) {
        {
          MonitorAutoUnlock unlockMonitor(mMonitor);
          rv = mPendingTasks.Execute(this);
        }

        if (!mPendingTasks.Finalize(rv)) {
          mStatus = rv;
          NS_WARNING("localStorage DB access broken");
        }
      }
      NotifyFlushCompletion();
    } else if (MOZ_LIKELY(mPreloads.Length())) {
      nsAutoPtr<DBOperation> op(mPreloads[0]);
      mPreloads.RemoveElementAt(0);
      {
        MonitorAutoUnlock unlockMonitor(mMonitor);
        op->PerformAndFinalize(this);
      }

      if (op->Type() == DBOperation::opPreloadUrgent) {
        SetDefaultPriority(); // urgent preload unscheduled
      }
    } else if (MOZ_UNLIKELY(!mStopIOThread)) {
      lockMonitor.Wait(TimeUntilFlush());
    }
  } // thread loop

  mStatus = ShutdownDatabase();
}

int
posix_memalign_impl(void **memptr, size_t alignment, size_t size)
{
  if (MOZ_UNLIKELY(!replace_malloc_initialized))
    init();
  if (MOZ_LIKELY(!replace_posix_memalign))
    return je_posix_memalign(memptr, alignment, size);
  return replace_posix_memalign(memptr, alignment, size);
}

  const CharT* match(uint64_t ref) {
    if (MOZ_LIKELY(ref < internedStrings.length())) {
      auto& string = internedStrings[ref];
      MOZ_ASSERT(string);
      return string.get();
    }

    return nullptr;
  }

size_t
malloc_usable_size_impl(usable_ptr_t ptr)
{
  if (MOZ_UNLIKELY(!replace_malloc_initialized))
    init();
  if (MOZ_LIKELY(!replace_malloc_usable_size))
    return je_malloc_usable_size(ptr);
  return replace_malloc_usable_size(ptr);
}

void*
valloc_impl(size_t size)
{
  if (MOZ_UNLIKELY(!replace_malloc_initialized))
    init();
  if (MOZ_LIKELY(!replace_valloc))
    return je_valloc(size);
  return replace_valloc(size);
}

void*
memalign_impl(size_t alignment, size_t size)
{
  if (MOZ_UNLIKELY(!replace_malloc_initialized))
    init();
  if (MOZ_LIKELY(!replace_memalign))
    return je_memalign(alignment, size);
  return replace_memalign(alignment, size);
}